After a confidential letter by Army Chief General VK Singh to the Prime Minister, warning that India's security is at risk because the Army's equipment is obsolete, was leaked to the media, Defence Minister A K Antony today said that whoever leaked the Army chief's letter to the PM is anti-national. Speaking at the Defence expo in New Delhi, Mr Antony said, "It only helps our enemies. The issue was raised in Parliament yesterday and the matter is under investigation. Will go to the roots and find out, can't spare those people. Strongest action will be taken under Indian law".